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Fair Values on Financial Assets and Liabilities (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 50,795 $ 22,781 [1] $ 22,343 $ 29,485
Corporate debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents   $ 1,000    
[1] The financial information in this column was derived from audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.